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initial C demo

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This commit is contained in:
Zack Buhman 2026-03-05 11:10:23 -06:00
parent 3b4604c6ba
commit 69086d51ba
11 changed files with 5153 additions and 1 deletions
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2
.gitignore vendored
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.\#* .\#*
\#* \#*
*~ *~
*.o
main

36
Makefile Normal file
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OPT = -Og -march=x86-64-v3
CSTD = -std=gnu23
CXXSTD = -std=gnu++23
CFLAGS += -g
CFLAGS += -I./include
CFLAGS += -Wall -Werror -Wfatal-errors -Wno-error=unused-variable -Wno-error=unused-but-set-variable
CFLAGS += $(shell pkg-config --cflags glfw3)
LDFLAGS += -lm
LDFLAGS += $(shell pkg-config --libs glfw3)
all:
%.o: %.c
$(CC) $(ARCH) $(CSTD) $(CFLAGS) $(OPT) -c $< -o $@
%.o: %.cpp
$(CXX) $(ARCH) $(CXXSTD) $(CFLAGS) $(OPT) -c $< -o $@
main: src/gl.o src/main.o src/opengl.o
$(CC) $(ARCH) $(LDFLAGS) $(OPT) -g $^ -o $@
clean:
find . -type f ! -name "*.*" -delete
.SUFFIXES:
.INTERMEDIATE:
.SECONDARY:
.PHONY: all clean phony
%: RCS/%,v
%: RCS/%
%: %,v
%: s.%
%: SCCS/s.%

7
conf.lua Normal file
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function love.conf(t)
t.window.width = 1024
t.window.height = 1024
t.window.depth = true
t.window.resizable = true
t.graphics.excluderenderers = {"vulkan", "metal"}
end

311
include/KHR/khrplatform.h Normal file
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#ifndef __khrplatform_h_
#define __khrplatform_h_
/*
** Copyright (c) 2008-2018 The Khronos Group Inc.
**
** Permission is hereby granted, free of charge, to any person obtaining a
** copy of this software and/or associated documentation files (the
** "Materials"), to deal in the Materials without restriction, including
** without limitation the rights to use, copy, modify, merge, publish,
** distribute, sublicense, and/or sell copies of the Materials, and to
** permit persons to whom the Materials are furnished to do so, subject to
** the following conditions:
**
** The above copyright notice and this permission notice shall be included
** in all copies or substantial portions of the Materials.
**
** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
*/
/* Khronos platform-specific types and definitions.
*
* The master copy of khrplatform.h is maintained in the Khronos EGL
* Registry repository at https://github.com/KhronosGroup/EGL-Registry
* The last semantic modification to khrplatform.h was at commit ID:
* 67a3e0864c2d75ea5287b9f3d2eb74a745936692
*
* Adopters may modify this file to suit their platform. Adopters are
* encouraged to submit platform specific modifications to the Khronos
* group so that they can be included in future versions of this file.
* Please submit changes by filing pull requests or issues on
* the EGL Registry repository linked above.
*
*
* See the Implementer's Guidelines for information about where this file
* should be located on your system and for more details of its use:
* http://www.khronos.org/registry/implementers_guide.pdf
*
* This file should be included as
* #include <KHR/khrplatform.h>
* by Khronos client API header files that use its types and defines.
*
* The types in khrplatform.h should only be used to define API-specific types.
*
* Types defined in khrplatform.h:
* khronos_int8_t signed 8 bit
* khronos_uint8_t unsigned 8 bit
* khronos_int16_t signed 16 bit
* khronos_uint16_t unsigned 16 bit
* khronos_int32_t signed 32 bit
* khronos_uint32_t unsigned 32 bit
* khronos_int64_t signed 64 bit
* khronos_uint64_t unsigned 64 bit
* khronos_intptr_t signed same number of bits as a pointer
* khronos_uintptr_t unsigned same number of bits as a pointer
* khronos_ssize_t signed size
* khronos_usize_t unsigned size
* khronos_float_t signed 32 bit floating point
* khronos_time_ns_t unsigned 64 bit time in nanoseconds
* khronos_utime_nanoseconds_t unsigned time interval or absolute time in
* nanoseconds
* khronos_stime_nanoseconds_t signed time interval in nanoseconds
* khronos_boolean_enum_t enumerated boolean type. This should
* only be used as a base type when a client API's boolean type is
* an enum. Client APIs which use an integer or other type for
* booleans cannot use this as the base type for their boolean.
*
* Tokens defined in khrplatform.h:
*
* KHRONOS_FALSE, KHRONOS_TRUE Enumerated boolean false/true values.
*
* KHRONOS_SUPPORT_INT64 is 1 if 64 bit integers are supported; otherwise 0.
* KHRONOS_SUPPORT_FLOAT is 1 if floats are supported; otherwise 0.
*
* Calling convention macros defined in this file:
* KHRONOS_APICALL
* KHRONOS_APIENTRY
* KHRONOS_APIATTRIBUTES
*
* These may be used in function prototypes as:
*
* KHRONOS_APICALL void KHRONOS_APIENTRY funcname(
* int arg1,
* int arg2) KHRONOS_APIATTRIBUTES;
*/
#if defined(__SCITECH_SNAP__) && !defined(KHRONOS_STATIC)
# define KHRONOS_STATIC 1
#endif
/*-------------------------------------------------------------------------
* Definition of KHRONOS_APICALL
*-------------------------------------------------------------------------
* This precedes the return type of the function in the function prototype.
*/
#if defined(KHRONOS_STATIC)
/* If the preprocessor constant KHRONOS_STATIC is defined, make the
* header compatible with static linking. */
# define KHRONOS_APICALL
#elif defined(_WIN32)
# define KHRONOS_APICALL __declspec(dllimport)
#elif defined (__SYMBIAN32__)
# define KHRONOS_APICALL IMPORT_C
#elif defined(__ANDROID__)
# define KHRONOS_APICALL __attribute__((visibility("default")))
#else
# define KHRONOS_APICALL
#endif
/*-------------------------------------------------------------------------
* Definition of KHRONOS_APIENTRY
*-------------------------------------------------------------------------
* This follows the return type of the function and precedes the function
* name in the function prototype.
*/
#if defined(_WIN32) && !defined(_WIN32_WCE) && !defined(__SCITECH_SNAP__)
/* Win32 but not WinCE */
# define KHRONOS_APIENTRY __stdcall
#else
# define KHRONOS_APIENTRY
#endif
/*-------------------------------------------------------------------------
* Definition of KHRONOS_APIATTRIBUTES
*-------------------------------------------------------------------------
* This follows the closing parenthesis of the function prototype arguments.
*/
#if defined (__ARMCC_2__)
#define KHRONOS_APIATTRIBUTES __softfp
#else
#define KHRONOS_APIATTRIBUTES
#endif
/*-------------------------------------------------------------------------
* basic type definitions
*-----------------------------------------------------------------------*/
#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || defined(__GNUC__) || defined(__SCO__) || defined(__USLC__)
/*
* Using <stdint.h>
*/
#include <stdint.h>
typedef int32_t khronos_int32_t;
typedef uint32_t khronos_uint32_t;
typedef int64_t khronos_int64_t;
typedef uint64_t khronos_uint64_t;
#define KHRONOS_SUPPORT_INT64 1
#define KHRONOS_SUPPORT_FLOAT 1
/*
* To support platform where unsigned long cannot be used interchangeably with
* inptr_t (e.g. CHERI-extended ISAs), we can use the stdint.h intptr_t.
* Ideally, we could just use (u)intptr_t everywhere, but this could result in
* ABI breakage if khronos_uintptr_t is changed from unsigned long to
* unsigned long long or similar (this results in different C++ name mangling).
* To avoid changes for existing platforms, we restrict usage of intptr_t to
* platforms where the size of a pointer is larger than the size of long.
*/
#if defined(__SIZEOF_LONG__) && defined(__SIZEOF_POINTER__)
#if __SIZEOF_POINTER__ > __SIZEOF_LONG__
#define KHRONOS_USE_INTPTR_T
#endif
#endif
#elif defined(__VMS ) || defined(__sgi)
/*
* Using <inttypes.h>
*/
#include <inttypes.h>
typedef int32_t khronos_int32_t;
typedef uint32_t khronos_uint32_t;
typedef int64_t khronos_int64_t;
typedef uint64_t khronos_uint64_t;
#define KHRONOS_SUPPORT_INT64 1
#define KHRONOS_SUPPORT_FLOAT 1
#elif defined(_WIN32) && !defined(__SCITECH_SNAP__)
/*
* Win32
*/
typedef __int32 khronos_int32_t;
typedef unsigned __int32 khronos_uint32_t;
typedef __int64 khronos_int64_t;
typedef unsigned __int64 khronos_uint64_t;
#define KHRONOS_SUPPORT_INT64 1
#define KHRONOS_SUPPORT_FLOAT 1
#elif defined(__sun__) || defined(__digital__)
/*
* Sun or Digital
*/
typedef int khronos_int32_t;
typedef unsigned int khronos_uint32_t;
#if defined(__arch64__) || defined(_LP64)
typedef long int khronos_int64_t;
typedef unsigned long int khronos_uint64_t;
#else
typedef long long int khronos_int64_t;
typedef unsigned long long int khronos_uint64_t;
#endif /* __arch64__ */
#define KHRONOS_SUPPORT_INT64 1
#define KHRONOS_SUPPORT_FLOAT 1
#elif 0
/*
* Hypothetical platform with no float or int64 support
*/
typedef int khronos_int32_t;
typedef unsigned int khronos_uint32_t;
#define KHRONOS_SUPPORT_INT64 0
#define KHRONOS_SUPPORT_FLOAT 0
#else
/*
* Generic fallback
*/
#include <stdint.h>
typedef int32_t khronos_int32_t;
typedef uint32_t khronos_uint32_t;
typedef int64_t khronos_int64_t;
typedef uint64_t khronos_uint64_t;
#define KHRONOS_SUPPORT_INT64 1
#define KHRONOS_SUPPORT_FLOAT 1
#endif
/*
* Types that are (so far) the same on all platforms
*/
typedef signed char khronos_int8_t;
typedef unsigned char khronos_uint8_t;
typedef signed short int khronos_int16_t;
typedef unsigned short int khronos_uint16_t;
/*
* Types that differ between LLP64 and LP64 architectures - in LLP64,
* pointers are 64 bits, but 'long' is still 32 bits. Win64 appears
* to be the only LLP64 architecture in current use.
*/
#ifdef KHRONOS_USE_INTPTR_T
typedef intptr_t khronos_intptr_t;
typedef uintptr_t khronos_uintptr_t;
#elif defined(_WIN64)
typedef signed long long int khronos_intptr_t;
typedef unsigned long long int khronos_uintptr_t;
#else
typedef signed long int khronos_intptr_t;
typedef unsigned long int khronos_uintptr_t;
#endif
#if defined(_WIN64)
typedef signed long long int khronos_ssize_t;
typedef unsigned long long int khronos_usize_t;
#else
typedef signed long int khronos_ssize_t;
typedef unsigned long int khronos_usize_t;
#endif
#if KHRONOS_SUPPORT_FLOAT
/*
* Float type
*/
typedef float khronos_float_t;
#endif
#if KHRONOS_SUPPORT_INT64
/* Time types
*
* These types can be used to represent a time interval in nanoseconds or
* an absolute Unadjusted System Time. Unadjusted System Time is the number
* of nanoseconds since some arbitrary system event (e.g. since the last
* time the system booted). The Unadjusted System Time is an unsigned
* 64 bit value that wraps back to 0 every 584 years. Time intervals
* may be either signed or unsigned.
*/
typedef khronos_uint64_t khronos_utime_nanoseconds_t;
typedef khronos_int64_t khronos_stime_nanoseconds_t;
#endif
/*
* Dummy value used to pad enum types to 32 bits.
*/
#ifndef KHRONOS_MAX_ENUM
#define KHRONOS_MAX_ENUM 0x7FFFFFFF
#endif
/*
* Enumerated boolean type
*
* Values other than zero should be considered to be true. Therefore
* comparisons should not be made against KHRONOS_TRUE.
*/
typedef enum {
KHRONOS_FALSE = 0,
KHRONOS_TRUE = 1,
KHRONOS_BOOLEAN_ENUM_FORCE_SIZE = KHRONOS_MAX_ENUM
} khronos_boolean_enum_t;
#endif /* __khrplatform_h_ */

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#version 330 core
out vec4 FragColor;
in vec3 ourColor;
void main()
{
FragColor = vec4(ourColor, 1.0f);
}

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shader/test.vert Normal file
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#version 330 core
layout (location = 0) in vec3 position;
layout (location = 1) in vec3 color;
out vec3 ourColor;
void main()
{
gl_Position = vec4(position, 1.0);
ourColor = color;
}

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src/main.c Normal file
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#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
#include <stdbool.h>
#include "glad/gl.h"
#include <GLFW/glfw3.h>
static const float vertex_buffer_data[] = {
// position // color
0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 0.010f, // bottom right
-0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.050f, // bottom left
0.0f, 0.5f, 0.0f, 0.0f, 0.0f, 1.0f, 0.100f, // top
};
const int vertex_buffer_data_size = (sizeof (vertex_buffer_data));
struct location {
struct {
unsigned int position;
unsigned int color;
} attrib;
};
extern unsigned int load();
int main()
{
glfwInitHint(GLFW_PLATFORM, GLFW_PLATFORM_X11);
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
//glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GLFW_TRUE);
GLFWwindow* window = glfwCreateWindow(1024, 1024, "LearnOpenGL", NULL, NULL);
if (window == NULL) {
const char* description;
glfwGetError(&description);
printf("Failed to create GLFW window: %s\n", description);
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
gladLoadGL(glfwGetProcAddress);
glViewport(0, 0, 1024, 1024);
unsigned int vertex_buffer;
glGenBuffers(1, &vertex_buffer);
glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
glBufferData(GL_ARRAY_BUFFER, vertex_buffer_data_size, vertex_buffer_data, GL_STATIC_DRAW);
unsigned int program = load();
struct location location;
location.attrib.position = glGetAttribLocation(program, "position");
location.attrib.color = glGetAttribLocation(program, "color");
printf("attributes:\n position %u\n color %u\n",
location.attrib.position,
location.attrib.color);
unsigned int vertex_array_object;
glGenVertexArrays(1, &vertex_array_object);
glBindVertexArray(vertex_array_object);
glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
glVertexAttribPointer(location.attrib.position,
3,
GL_FLOAT,
GL_FALSE,
(sizeof (float)) * 7,
(void*)0
);
glVertexAttribPointer(location.attrib.color,
4,
GL_FLOAT,
GL_FALSE,
(sizeof (float)) * 7,
(void*)(3 * 4)
);
glEnableVertexAttribArray(location.attrib.position);
glEnableVertexAttribArray(location.attrib.color);
while(!glfwWindowShouldClose(window)) {
if(glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(window, true);
glClearColor(0.1f, 0.1f, 0.1f, 0.1f);
glClear(GL_COLOR_BUFFER_BIT);
//
// render
//
glUseProgram(program);
glBindVertexArray(vertex_array_object);
glDrawArrays(GL_TRIANGLES, 0, 3);
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwTerminate();
return 0;
}

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#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include "glad/gl.h"
static void * read_file(const char * filename, int * out_size)
{
FILE * f = fopen(filename, "rb");
if (f == NULL) {
fprintf(stderr, "fopen(%s): %s\n", filename, strerror(errno));
return NULL;
}
int fseek_end_ret = fseek(f, 0, SEEK_END);
if (fseek_end_ret < 0) {
fprintf(stderr, "fseek(%s, SEEK_END): %s\n", filename, strerror(errno));
return NULL;
}
long size = ftell(f);
if (size < 0) {
fprintf(stderr, "ftell(%s): %s\n", filename, strerror(errno));
return NULL;
}
int fseek_set_ret = fseek(f, 0, SEEK_SET);
if (fseek_set_ret < 0) {
fprintf(stderr, "lseek(%s, SEEK_SET): %s\n", filename, strerror(errno));
return NULL;
}
rewind(f);
void * buf = malloc(size);
size_t read_size = fread(buf, 1, size, f);
if (read_size != size) {
fprintf(stderr, "fread(%s): %s\n", filename, strerror(errno));
return NULL;
}
*out_size = size;
return buf;
}
unsigned int compile(const char * vertex_source,
int vertex_source_size,
const char * fragment_source,
int fragment_source_size)
{
int compile_status;
char info_log[512];
// vertex shader
unsigned int vertex_shader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertex_shader, 1, &vertex_source, &vertex_source_size);
glCompileShader(vertex_shader);
glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &compile_status);
if (!compile_status) {
glGetShaderInfoLog(vertex_shader, 512, NULL, info_log);
fprintf(stderr, "vertex shader compile: %s\n", info_log);
}
// fragment shader
unsigned int fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragment_shader, 1, &fragment_source, &fragment_source_size);
glCompileShader(fragment_shader);
glGetShaderiv(fragment_shader, GL_COMPILE_STATUS, &compile_status);
if (!compile_status) {
glGetShaderInfoLog(fragment_shader, 512, NULL, info_log);
fprintf(stderr, "fragment shader compile: %s\n", info_log);
}
// link shaders
unsigned int shader_program = glCreateProgram();
glAttachShader(shader_program, vertex_shader);
glAttachShader(shader_program, fragment_shader);
glLinkProgram(shader_program);
glGetProgramiv(shader_program, GL_LINK_STATUS, &compile_status);
if (!compile_status) {
glGetProgramInfoLog(shader_program, 512, NULL, info_log);
fprintf(stderr, "shader link: %s\n", info_log);
}
glDeleteShader(vertex_shader);
glDeleteShader(fragment_shader);
return shader_program;
}
static unsigned int test_program;
unsigned int load()
{
int vertex_source_size;
const char * vertex_source = read_file("shader/test.vert", &vertex_source_size);
assert(vertex_source != NULL);
int fragment_source_size;
const char * fragment_source = read_file("shader/test.frag", &fragment_source_size);
assert(fragment_source != NULL);
test_program = compile(vertex_source, vertex_source_size,
fragment_source, fragment_source_size);
return test_program;
}