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Got rendering a triangle working

This commit is contained in:
Eric-Paul Ickhorn 2023-10-10 12:43:34 +02:00
parent 2c2660bf1b
commit 797f4a49a4
7 changed files with 5404 additions and 0 deletions
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12
build.bash Normal file
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#!/usr/bin/env bash
mkdir -p dependencies/build/
gcc -o dependencies/build/glad.o \
-c dependencies/sources/glad/glad.c \
-I dependencies/include/
gcc -o techneck.elf \
code/source-c/*.c dependencies/build/glad.o \
-I dependencies/include -lGL -lSDL2

218
code/source-c/main.c Normal file
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#include <glad/glad.h>
#include <SDL2/SDL.h>
#include <stdbool.h>
#include <linmath.h>
SDL_Window *window = NULL;
SDL_GLContext gl_context;
int main_shader = 0;
float triangle_vertices[9] = {
0.0f, 0.0f, 0.0f,
0.0f, 1.0f, 0.0f,
1.0f, 0.0f, 0.0f
};
typedef struct tc_vec3
{
float x;
float y;
float z;
} tc_vec3_s;
typedef struct tc_object
{
int vbo;
int vao;
} tc_object_s;
typedef struct tc_block
{
tc_vec3_s position;
tc_object_s drawing;
} tc_block_s;
tc_block_s block;
void render_block(tc_block_s block)
{
glBindBuffer(GL_ARRAY_BUFFER, block.drawing.vbo);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void *) 0);
glEnableVertexAttribArray(0);
glUseProgram(main_shader);
glDrawArrays(GL_TRIANGLES, 0, 3);
}
tc_block_s tc_new_block_at_3f(float x, float y, float z)
{
tc_block_s block;
block.position.x = x;
block.position.y = y;
block.position.z = z;
glGenBuffers(1, &block.drawing.vbo);
glBindBuffer(GL_ARRAY_BUFFER, block.drawing.vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 9, &triangle_vertices[0], GL_STATIC_DRAW);
return block;
}
char * load_file(char *path, int *out_len)
{
FILE *file = NULL;
if((file = fopen(path, "r")) != NULL)
{
fseek(file, 0, SEEK_END);
int length = ftell(file);
fseek(file, 0, SEEK_SET);
char *content = malloc(length+1);
fread(content, 1, length, file);
if(out_len != NULL)
{
*out_len = length;
}
return content;
}
return NULL;
}
int setup_shaders(char *vertex_path, char *fragment_path)
{
int vertex_shader = glCreateShader(GL_VERTEX_SHADER);
int fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
int len_vertex_source = 0;
char *vertex_source = load_file(vertex_path, &len_vertex_source);
int len_fragment_source = 0;
char *fragment_source = load_file(fragment_path, &len_fragment_source);
glShaderSource(vertex_shader, 1, &vertex_source, &len_vertex_source);
glShaderSource(fragment_shader, 1, &fragment_source, &len_fragment_source);
glCompileShader(vertex_shader);
glCompileShader(fragment_shader);
int vertex_compile_status = 0;
glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &vertex_compile_status);
if(vertex_compile_status != GL_TRUE)
{
int log_length = 0;
glGetShaderiv(vertex_shader, GL_INFO_LOG_LENGTH, &log_length);
char *info_log = malloc(log_length+1);
glGetShaderInfoLog(vertex_shader, log_length, &log_length, info_log);
printf("VERTEX SHADER FAILED COMPILING! ERROR: %s\n", info_log);
return -1;
}
int fragment_compile_status = 0;
glGetShaderiv(fragment_shader, GL_COMPILE_STATUS, &fragment_compile_status);
if(fragment_compile_status != GL_TRUE)
{
int log_length = 0;
glGetShaderiv(fragment_shader, GL_INFO_LOG_LENGTH, &log_length);
char *info_log = malloc(log_length+1);
glGetShaderInfoLog(fragment_shader, log_length, &log_length, info_log);
printf("FRAGMENT SHADER FAILED COMPILING! ERROR: %s\n", info_log);
return -1;
}
int program = glCreateProgram();
glAttachShader(program, vertex_shader);
glAttachShader(program, fragment_shader);
glLinkProgram(program);
return program;
}
void cleanup()
{
SDL_GL_DeleteContext(gl_context);
SDL_DestroyWindow(window);
}
void render()
{
float color[4] = { 0.0f, 1.0f, 0.0f, 1.0f };
glClearBufferfv(GL_COLOR, 0, color);
render_block(block);
SDL_GL_SwapWindow(window);
}
int main(int argc, char **argv)
{
SDL_Init(SDL_INIT_EVERYTHING);
window = SDL_CreateWindow(
"Techneck",
SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED,
1200,
800,
SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE
);
gl_context = SDL_GL_CreateContext(window);
gladLoadGLLoader(&SDL_GL_GetProcAddress);
gladLoadGL();
main_shader = setup_shaders("vertex_shader.glsl", "fragment_shader.glsl");
block = tc_new_block_at_3f(0.0, 0.0, 0.0);
int64_t frame_index = 1;
while(frame_index > 0)
{
SDL_Event event;
while(SDL_PollEvent(&event))
{
switch(event.type)
{
case SDL_QUIT:
SDL_HideWindow(window);
frame_index = -1;
break;
break;
case SDL_WINDOWEVENT:
{
if(event.window.event == SDL_WINDOWEVENT_RESIZED)
{
puts("RESIZED");
}
} break;
}
}
render();
if(frame_index == 1)
{
SDL_ShowWindow(window);
}
++frame_index;
SDL_Delay(1000/60);
}
cleanup();
SDL_Quit();
return 0;
}

311
dependencies/include/KHR/khrplatform.h vendored 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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dependencies/include/glad/glad.h vendored Normal file
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fragment_shader.glsl Normal file
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#version 420 core
out vec4 color;
void main() {
color = vec4(1.0, 0.0, 0.0, 1.0);
}

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vertex_shader.glsl Normal file
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#version 420 core
layout(location=0) in vec3 pos;
void main() {
gl_Position = vec4(pos, 1.0);
}